Method and machine for producing paper containers



Aug. 15, 1939 KUCHLER 2,169,345

METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1957 ll Sheets-Sheet 1 E} f/gd lfluemoz' hawk Aug. 15, 1939 KUCHLER 2,169,345

METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1937 ll Sheets-Sheet 2 K. KUCHLER Aug. 15, 1939 METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1957 ll Sheets-Sheet 3 [271/627 for: @ZMv fizz 1939 K. KUCHLER 2,169,345-

METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1937 ll Sheets-Sheet 4 Q 2 W 6167 7 l 0 gr 0' 52 0916a 71 a1 7.5 as 77 9- 766 H fly 6277b //a/'l Kzac/aZEW Aug. 15, 1939 KUCHLER 2,169,345

METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1957 ll Sheets-Sheet 5 Aug. 15, 1939 KUCHLER 2,169,345

METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1937 ll Sheets-Sheet 6 I I I I I I l I I l I I I I I I 1&

1939 K. KUCHLER 2,169,345

METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1937 ll Sheets-Sheet 7 I H9: 776 [WI anion A az'Z' K. KUCHLER Aug. 15, 1939 METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1937 ll Sheets-Sheet 8 K. KUCHLER Aug. 15, 1939 METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1937 ll Sheets-Sheet 9 V/Q/AM [771/677 for CA'ZA/ Aug. 15, 1939 KUCHLER 2,169,345

METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Filed May 24, 1937 ll Sheets-Sheet 10 Aug. 15, 1939 K. KUCHLER 2,169,345

METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS ralenteu Aug. 10, 1:10

UNITED STATES PATENT OFFICE METHOD AND MACHINE FOR PRODUCING PAPER CONTAINERS Karl Kiichler, Dusseldorf, Germany, assignor to Jagenberg-Werke Akt.-Ges., Dusseldorf, Germany Application May 24, 1937, Serial No. 144,513

19 Claims.

v ducing the container bodies.

In the method hitherto preferred for the production of such paper containers a body blank is formed into a. hollow tubular body by glueing the length seam; immediately following this operation the bottom is inserted into the container body. It is known to place the dish-shaped bottom on the top of a form block corresponding to the interior of the container, to form the container body round this form block afterwards, and finally turn the projecting end of the container body over the outwardly directed skirt of the dish-shaped bottom. It is, furthermore,

known to place the dish-shaped bottom into the recess of a tapered form block and to push it from the recess into the container body immediately after the container body has been glued round the form block.

In such a method of production the output obtainable is limited by the time being necessary for the setting of the length seam of the container body. This space of time necessary for the setting of the glued seam prevents an increase of the running speed of the machines work ing in accordance with the known method mentioned for the production of paper containers.

The method according to this invention enables a considerable increase of the Working speed when manufacturing paper containers and the achievement of an especially tight seat of the dish-shaped bottom in the conical container body. In the method under invention for producing conical paper containers which consist of a tubular container body and a dish-shaped bottom firstly a flat trapeziform tube is glued for the body and after setting of the joint the dishshaped bottom is pressed into the tubular opened tube through the wider end in direction of the narrow end of the tube. The manufacture of the flat trapeziform tube being formed at first can be performed with the aid of folding and glueing machines at high speed. Since the bottom is inserted into the bottom part only after the glueing seam of the tubular body part has sufficiently set, the inserting of the bottom can also be done at high speed; the bottom can be pressed especially firm into the bottom part as well. The inserting of the dish-shaped bottom part is facilitated by the conical shape of the container body and by this it is, furthermore achieved that the bottom can be pressed in as far as to fit sufficiently tight and to be wedged 1 into the conical container body in some way. The bottom receives a firm seat in the conical container body by its dish-shaped form, because the skirts of the bottom are sufiiciently large. 5

The method under invention is especially effective when producing such know-n paper containers which on one end have a rounded cross section and on the other end a square-shaped cross section; preferably such paper containers ll).

are considered which have a round or oval-shaped cross section at the bottom and a square-shaped one at the upper end. According to further development of the method under invention score or creasing lines are provided in the blank serving for forming the flat glued tube when producing such paper containers; the number and arrangement of the score or creasing lines corresponds to the corners of the container, accordingly there are more crease lines provided than are necessary for forming the flat tube. The score and creasing lines extend mostly over the whole length of the blank.

Since the score or creasing lines are, according to the invention, extended nearly all over the Whole length of blank, the flat tube can easily be formed and distended in a hollow condition. By means of the score or creasing lines mentioned the performance of uniform folding lines and also the forming of a square-shaped cross section of container at one end of the body is guaranteed. It is eliminated that irregular folding lines are produced. That in spite of the creasing lines extending almost over the whole length of blank a round cross section and not a multiple-cornered cross section is obtained at the bottom end of the container is due to the fact that the bottom is pressed very tightly into the tubular opened body part, the length seam of which has already become tight by the preceding operation of preforming a glued flat tube, and forces the bottom end of the container body into its round shape.

The invention, furthermore, relates to the manufacture of flat trapeziform tubes which later on 5 form the container body. According to the invention a blank which for instance shall be folded along two angular arranged folding lines firstly is advanced in the direction of the one and then in the direction of the other folding line. Fur- 5 thermore, the blank, according to the invention, is slightly oscillated in its plane after folding of one blank part over one folding line and prior to folding of another blank part over a second folding line not running parallel to the first folding line. In this way the folding lines differing from each other are one after another brought in correspondence with the direction of advance.

After glueing of the length seam, according to the invention, the flat trapeziform tubes are slightly opened and nested so that a mainly flat pile of nested paper container bodies is produced. By this it is achieved that the length seam can entirely set during the stay of the glued tube in the pile. A reopening of the joint possibly having not quite set yet is eliminated by the fact that the glued seam of each single tube is kept by the preceding and the following tube. For the purpose of securing the setting of the glued seam a pressure could be exerted on to the flat faces of the pile. It, furthermore, corresponds to the invention that by setting up the flat pile produced according to the aforementioned remarks those longitudinal edges that remain untouched during the glueing and folding of the flat tube are prefolded. When setting up the formerly flat pile in the described manner the prebending of the folding lines not being creased yet is done simultaneously on a greater number of tubes; thus -in contradiction to the known working method-it is not necessary that for the purpose of prebending the folding lines not yet creased each tube is handled singly.

In the following an example of the way in which the process under invention may be carried into effect and a machine for performing this process are described and are demonstrated by the following drawings.

Figs. 1-3 demonstrate the performance of the collapsed tube from a prepared blank.

Fig. 4 shows a section according to line IV-IV of Fig, 1.

Fig. 5 shows a section according to line VV of Fig. 3.

Fig. 6 shows a section according to line VI-VI of Fig. 3.

Figs. 7-11 explain the inserting of the bottom into the container body.

Fig. 12 illustrates the finished paper container.

Fig. 13 shows in an enlarged scale a section through the lower part of the tilted paper container with special tightening of the bottom part.

Figs. 14 and 15 show-also in an enlarged scaleeach one vertical and horizontal section through the tools serving for inserting the bottom into the container body.

Figs. lfia-c show a vertical section through a machine for manufacturing the container bodies.

Figs. l'la-c show a plan view of the track of tools of the machine demonstrated in Figs. 16a-c which have to be passed by the blank to be folded and glued.

Figs. 18-28 illustrate vertical cross sections of the track to be passed by the blanks according to lines XVIII-XVIII to XXVIII-XXVIII of Figs. 170-0.

Figs. 29 and 30 show a plan view each of a part of another construction of the track of tools which has to be passed by the blanks to be folded and glued.

When manufacturing a paper container which corresponds to Fig. 12 it is started from the blank for the body part demonstrated in Figs. 1 and 4. The blank is provided with four score and creasing lines a, b, c, d the position of which corresponds to the corners of the upper part of the container. These score or creasing lines extend over the whole length of the blank. It will, however, also be suflicient if the creasing lines extend over the greater part of the length of the blank.

Parallel to a longitudinal edge of the blank a strip of adhesive is is applied. Then, according to Figs. 2 and 5, two panels of the blank are folded over the prepared creasing line b and finally, according to Figs. 3 and 6, the panel provided with adhesive if; over the prepared scoring line d. In this manner a collapsed tube is performed. The edges overlapping each other are joined by the strip of adhesive 70. This joint sets entirely prior to a further treatment of the formed tube.

After setting of the joint the collapsed tube is opened so that a square tube is formed. Fig. 8 shows a plan view of the square tube formed in this way. Into this tube forming the container body 111. the dish-shaped bottom it having an annular cross section is pressed in. Fig. '7 shows that this dish-shaped bottom is inserted in the distended end of the container body and pressed in in the direction of the narrower end of the body m. The skirts of the dish-shaped bottom part it are facing hereby the narrower end of the body, By the pressing in the bottom part gets into the position demonstrated in Fig. 9, the bottom part being tightly pressed into the container body.

Fig. shows a plan view of the container body provided with this pressed in body part it. From this figure it is to be seen that the narrower, folmerly square end of the body has adapted an annular cross section by pressing in of the bottom part.

The edges of the container body wt projecting over the skirts of the bottom part it are flanged inwardly, as shown in Fig. 11. The paper container manufactured in this manner is paraflined, whereby the bottom is fastened to the container body and tightened. The skirts of the bottom can also be coated with a strip of glue on their outer face before they are pressed in. The em ployment of such a glue coating is to be recommended in such cases in which the paper container is not impregnated afterwards. In such cases in which the container is not impregnated the impermeability can be improved by pressing in an annular groove 7 in the lower rim of the container body and the skirt of the bottom, according to Fig. 13.

When inserting the bottom into the container body preferably the tools demonstrated in Figs. 14 and which essentially comprise the form block 3| and two holding jaws 34 corresponding to the form block are employed. In the form block 3| a rod 32 is arranged moveably carrying on its upper end a plunger head 33 the diameter of which is slightly smaller than the diameter of the bottom it to be inserted into the container body m. The jaws 34 are provided with an elastic lining 35 made of rubber or the like and are carried by the arms 36 being operated in a suitable manner. Since, however, such operations are known, it is not necessary to explain them here.

Whilst the parts 32, 33 are in the position illustrated. a bottom 11 is placed into the recess of the form block 3! situated above the plunger head 33. After this an opened container body m is placed on the form block, the jaws 34 being lifted from the form block. After placing the container body m on the form block 3| the holding jaws 34 are moved towards the form block. Before termination of the movement directed against the form block the jaws perform a small movement directed parallel to the body surface of the form block. Whilst the container body is kept by the jaws 34 the plunger 32, 33 is moved upwards and presses the bottom into its final position, as illustrated in Fig. 14 in dotted lines and marked n.

For producing large quantities of container bodies serving for the manufacture of paper containers in accordance with the method mentioned,

a machine illustrated in Figs. 16-28 is preferably suitable.

The frame of the machine is essentially formed by two lateral stands 40, 4| and a table 42 connecting these two lateral stands. On the lateral stand 40 supports are arranged carrying the main driving shaft 43. The main driving shaft 43 is driven by some source of power by means of a pulley 43.

The machine contains a magazinesee Figs. 16a and 17a. In this magazine the pile of blanks z rests on three bands 44 which are guided over the rollers 45 and 46. The roller 46 is driven by the main shaft 43 over a pair of bevel gears.

. When rotating in the direction of the arrows illustrated, these bands push one blank .2 after the other out of the magazine. The vertical ledges 4'! keep back that part of the pile which is above the lowermost blank so that always only the lowermost blank can be pushed out.

The blanks being prepared for the later folding operation by the creasing lines a, b, c, d are placed in the magazine in such a way that the lateral edge, parallel to which the glue strip R: has to be applied, corresponds to the direction of pushing out.

The blanks 2 being pushed out of the magazine are conveyed on to a conveyor band 48, which is guided over the table 42 and the guiding rollers 49, 50 and 5| supported in the machine frame.

The guide roller 5| is driven by the main shaft 43 by means of a pair of bevelled gears. The conveying band 48 is tightened in a manner known by a pair of rolls 52, 53 Which are under the action of a spring not illustrated.

Above the upper strand of the conveying band 48 two guiding rails 54, 55 and a roller beam 56 are arranged. On the lower side of the roller beam 56 a lot of small rolls are arranged being easily turnable--as illustrated in Figs. 18-20. These rolls of the roller beam 56 are yieldingly pressed against the conveyor band 48 or against the blank 2 being placed on it and effect in this way a safe conveying of the blank 2 on the con veyor band.

Below the table 42 of the machine a glue tank 51 is arranged being adjustable with regard to its height. When this glue tank 51 is in a lifted position a glue disc 58 immerses in it--see Figs. 16a, 17a and 18. The glue disc 58 is arranged on a shaft 58 which is driven by a pair of bevel gears from the main driving shaft 43. The upper part of the glue disc 58 projects through a recess of the machine table 42 so that the advanced blanks 2 receive a glue strip is parallel to their lateral edge, see Fig. 1.

Furthermore-as shown in Figs. 16a, 17a and 19a shaft 60 is arranged below the track of the blanks 2, the shaft carrying a disc 6| the upper part of which projects through a slot of the table. Above the table a corresponding disc 63 is supported slightly pivotable in an oscillating arm 62. The two discs are rippled on their circumference. Preferably the outer rippled rim of the two discs is made of rubber or a similar material. The shaft 68 is driven by the main shaft 43 by a pair of bevelled gears at such a speed that the peripheral velocity of the disc BI is slightly slowor than the speed of the conveying belt 48. The

disc 63 is also driven in a corresponding manner by the pair of gear wheels 64, 65.

When the blanks being pressed by the roller beam 56 against the conveyor belt 48 are advanced, only a lateral part of the blanks gets between the discs 8|, 63 running slightly slower than the belt 48. Hereby this lateral part of the blank is delayed against the centre part. The blank is oscillated in such a way that the folding line gets into the direction of running. At the same time the part of the blank lying lateral to the folding line 0 slides on the folding rail 66 bent in a known manner. The corresponding lateral part of the blank-as shown in Figs. 17a, 19 and 20--is lifted and folded over the prepared folding line 0. This folding operation is facilitated by the fact that the folding line 0 corresponds to the sharpened lateral edge of the guide rail 55. As soon as the lateral part mentioned has arrived on the folding rail 66 and been lifted suflicientlysee Fig. 20-the other lateral part of the blank is again delayed. This delay is caused by the parts 60 and 63' corresponding to the parts 60 and 63. That is to say that the discs 6| and 63' delay again the lateral edges of the blank being advanced by the conveying belt 48 and effect such a turn of the blank that the foldingline a is oscillated into the direction of running and is situated directly adjacent to the sharpened edge of the rail 54. That part of the blank Z lying lateral to the folding line a runs during the further advance of the blank on a folding rail 61 and is also lifted.

In the machine there are, furthermore, folding belts 68 and 68' arranged (see Figs. 16b and 1711). These folding belts are guided in a manner known over guiding rollers '69, 10, 8| and 69', 10', 8| respectively. By means of these folding belts and lateral blank parts being lifted by the folding rails 66 and 6'! are entirely folded down, so that from the blank now a trapeziform flat tube is formed. The flat tube is advanced by the conveyor belt 48 and arrives in the pressure station. This pressure station chiefly consists of the shafts ll-18 arranged in pairs, each shaft carrying a pair of pressure rollers. The pressure rollers 8| and 8| of the first upper shafts I! serve at the same time as guide rollers for the folding belts 68, 68'as has been mentioned before. From the roll the shafts '|||8 are driven in the correct direction of turning by means of intermediate gear wheels so that the pressure rollers arranged on the shafts l||8 guide the glued flat trapeziform tubes between themselves like a rolling mill. By means of the pressure rollers being arranged on the side adjacent to the main shaft-as pressure roller 8|'-a pressure is exerted on the gluing seam by which setting of the 7 joint is facilitated.

Before, however, the flat trapeziform tubes arrive in the pressure station a corner of the trapeziforrn. tube touches a roll 89 projecting slightly into the track of the trapeziform flat tubes. By this the tubes are slightly oscillated so that, when the tubes enter the pressure station. the centre line of the trapezoid corresponds to the direction of running.

When the flat trapeziform tubes are ejected by the pressure rollers of the last pair of shafts 11, I8 of the pressure station, they are guided between two rotatable rolls 90, 98' arranged on both sides of the track. These rolls have a grooved circumference-see Figs. 17b and 24. The space between these two rolls 90 and 98 is slightly smaller than the largest width of the flat trapeziform tube. Each trapeziform tube is, therefore, when passing between these rolls 90 and 90' slightly opened at its rear part, at the same time a delay in the advance of the tube takes place. By the joined effect of this delay and the opening it is achieved that the front part of an advanced tube is pushed into the rear part of a preceding tube and a mainly fiat pile of nested trapeziform fiat tubes is formed. This pile always being formed new between the rolls 90 and 90 is advanced by the belts 9|, 92 guided over the rollers 93-96. The roller 94 is driven by the main shaft 43 by a pair of bevel gears and transfers by gear wheels arranged on the other side of the machine the movement on the roller 93 of the upper belt Hi. The belts 9i and 92 are arranged in such a way that during the advance the flat pile is tightly pressed by the strands of the belts facing each other. By this the tight setting of the glued seam is facilitated.

These joints are suificiently tight when the pile leaves the belts 9!, 92. The pile then gets between a pair of rolls 9'! and 9'! which are demonstrated in Figs. 16c, 17c and 26. These rolls are driven by the main driving shaft 43 over a pair of screw gears 98, 99, the shaft I00, and one pair of bevelled gears each, ll, I02 and NH, I02 respectively. The circumference of these rolls 91, 91' is grooved angularly. The two rolls 91, 91 are arranged in such a way that the space between them corresponds nearly to the cross section of the opened flat tubes. The mainly flat pile formed by nested, glued, trapeziform tubes is, therefore, opened whilst running between the two rolls 97, 97'. Furthermore, there are provided two cylindrical rolls I03 and I03 on both sides of the track of the pile which are driven in a corresponding way by the main shaft 43 over a pair of screw gears, a horizontal shaft, and two pairs of bevel gears-see Figs. 17c and 27. When passing between these cylindrical rolls the open tube is collapsed in such a way that the plane of this recollapsed tube is directed vertically to the former plane of the formerly flat pile. This again collapsed pile is again opened by a pair of rolls I04, I04'--see Figs. 16c, 17c and 28. These rolls are arranged on the shafts I05 and I05. The shaft I05 is driven by the main shaft 43 of the machine by a pair of bevelled gears and transfers this drive by a pair of gear wheels I06, I06 to the upper shaft I05. The two rolls I04 and I04 are formed in such a way that the space between them corresponds to the cross section of the tubular opened tube,

By opening of the fiat pile, recollapsing, and reopening, it is effected that all the prepared folding lines ad are prefolded and are made sufficiently flexible.

It has been described before that the blanks on the way from the glueing disc 58 to the folding rail 66 are oscillated in such a way that the folding line 0 formerly directed aslant to the advance movement is brought in a parallel position to the advance movement and, therefore, to the rail 55. Especially if the blanks are made of comparatively stiff cardboard or the like the device serving for oscillating the blanks a can be simplified, as shown in Fig. 29. Lateral to the track of the blanks z a stop I I0 is arranged in such a way that during the advance of the blank 2 the lateral edge of this touches the slightly bent stop, by which-as shown in Fig. 29the blank is oscillated in its plane in such a way that the folding line 0 over which the next folding has to be performed corresponds to the direction of movement.

In case the blanks a are conveyed in such a way that-as illustrated in Fig. 30--the long edge of the trapeziform blank is placed in front of the direction of movement, the peripheral velocity of the discs, engaging the side panel of the blank and oscillating the latter in such a way that the folding lines arrive in the direction of movement, must be quicker than the speed with which the blanks a are advanced by the conveying belt 48. Fig. 30 demonstrates that one panel of the blank is passed between the upper disc 63" and a lower disc not to be seen in the drawing and in consequence of the great peripheral velocity of these two discs is speeded up. This increase in speed of one side panel of the blank 2 effects a turn in an anticlockwise direction. By this turn of the blank the folding line 0 formerly directed aslant to the advance movement is adjusted parallel to the direction of the advance movement.

What I claim is:

l. A method for producing paper containers of the kind having a tubular conical body and a dish-shaped bottom, said method comprising the forming of a flat trapeziform tube by folding and glueing, the opening of said tube from a flat condition into a distended one after setting of its glued joint, and the pressing in of a dish-shaped bottom into said distended tube through the enlarged end in the direction to the narrower end.

2. A method for producing paper containers of the kind having a tubular conical body and a dish-shaped bottom, said method comprising the forming of a flat trapeziform tube by folding and glueing, the breaking of the folding lines corresponding to the longitudinal edges of the container body by opening the fiat tube and by continuing the distending motion beyond the fully opened condition to a recollapsed one, and the pressing in of a dish-shaped bottom into the reopened tube.

3. A method for producing paper containers of the kind having a tubular conical bottom and a dish-shaped bottom, said method comprising the scoring or creasing of longitudinal folding lines at a blank, the applying of a longitudinal adhesive strip on to said blank, the folding of said blank into the shape of a flat trapeziform tube, the opening of said tube from a flat condition into a distended one after setting of its glued joint, and the pressing in of a dish-shaped bottom into said distended tube through the enlarged end in the direction to the narrower end.

4. A method for producing paper containers of the kind having a rounded cross-section at the bottom and an angular cross-section at the upper end, said method comprising the providing of the blank with longitudinal scored or creased lines corresponding to the position of the edges of the container to be formed and extending nearly over the whole length of the blank, the forming of a fiat trapeziform tube by folding and glueing said blank, the opening of said tube from a flat condition into an angular hollow one, and the pressing in of a dish-shaped bottom of a rounded cross-section into said opened tube through the enlarged end in the direction to the narrower end, thus transforming the angular cross-section of the narrower end of the tubular body into a rounded one.

5. A method for producing paper containers of the kind having a tubular conical body and a dish-shaped bottom, said method comprising the forming of flat trapeziform tubes by folding and glueing, the nesting of said fiat tubes, the opening of the stack consisting of the nested flat tubes from a fiat condition into a distended one, the removing of the opened tubes singly one after the other from said stack, and the pressing in of a dish-shaped bottom into each of the opened tubes removed from said stack.

6. A method for producing paper containers of the kind having a tubular conical body and a dish-shaped bottom, said method comprising the forming of flat trapeziform tubes by folding and glueing, the nesting of said fiat tubes, the exerting of pressure against the flat sides of the stack composed of nested tubes during a period of time sufficient to insure setting of the glued joint, and the pressing in of a dish-shaped bottom into each of the tubes opened and removed from said stack.

7. A method for producing paper containers of the kind having a tubular conical body and a dish-shaped bottom, said method comprising the forming of fiat trapeziform tubes by folding and glueing, the nesting of said tubes, the opening of the stack composed of nested flat tubes from a fiat condition into a distended one, the recollapsing of theopened tubular stack into a second flat condition being arranged at an angle to the original flat condition, the reopening of the fiat tubes, and the pressing in of a dish-shaped bottom into each of the tubes opened and removed from said stack.

8. In the production of conical paper containers of the type having a glued length seam those steps which include the forming of a fiat trapeziform tube by folding one lateral part of the blank during the movement of the blank in the direction of the line to be folded firstly and by folding the other lateral part during the movement of the blank in the direction of the second folding line arranged at an angle with respect to the first folding line.

9. In the production of conical paper containers of the type having a glued length seam the steps of forming of a fiat trapeziform tube, those steps including the folding of one lateral part of the blank during moving the blank in the direction of the first folding line, the turning of the blank remaining in its plane over the angle between the first and the second folding line, and the folding of the other lateral part of the blank during the further movement of the blank in the original direction; the second line to be folded corresponding to the direction of movement during the second folding operation.

10. In the production of conical paper containers of the type having a glued length seam the steps of forming a flat trapeziform tube, those steps including the applying of an adhesive strip parallel to a lateral edge of the blank during moving the blank in the direction of said lateral edge, the turning of the blank over the angle between said lateral edge and the first line to be folded, the folding of one lateral part of the blank during moving the blank in the direction of the first folding line, the turning of the blank remaining in its plane over the angle between the first and the second folding line, and the folding of the other lateral part of the blank during the further movement of the blank in the original direction; the second line to be folded corresponding to the direction of movement during the second folding operation.

11. In the production of conical paper containers of the type having a glued length seam those steps which include the folding of the lateral parts of the blank whilst moving the blank in the direction of the line to be folded, the turning of the folded and glued trapeziform fiat tube to such a degree that the axis of the trapeziform tube gets in alignment with the direction of forward movement of said tube, and the nesting of the tubes.

12. A machine for producing the bodies of conical paper containers comprising means for forwarding the blank, means for applying an adhesive strip to the blank, means for folding the lateral parts of the blank, means for nesting the produced fla ti tubesin one another, means for exerting pressure against the flat sides of the stack formed by the nested flat tubes, and means for opening said stack from a flat condition to a tubular one.

13. A machine according to claim 122 the means for opening the flat stack consisting of a pair of rotatable rollers having a circumferential angular groove and being arranged at either side of the path of the forwarded stack of nested tubes.

14. A machine for producing the bodies of conical paper containers comprising means for forwarding the blank, means for applying an adhesive strip to the blank, means for folding the lateral parts of the blank, means for nesting the produced fiat tubes in one another, means for exerting pressure against the fiat sides of the stack formed by the nested fiat tubes, and means for opening, refiatten'ing, and reopening said stack in order to render limp or supple the longitudinal edges of the body of the container to be produced.

15. A machine according to claim 1%, the means for reflattening the opened stack of nested containers consisting of a pair of rotatable cylindrical rollers; the clearance between these rollers corresponding to the thickness of the refiattened stack.

16. A machine for producing bodies of conical paper containers, comprising means for forwarding the blank, means for applying an adhesive strip to the blank, means for folding the lateral parts of the blank, means for nes tipg the produced flat tubes in one anotherf and means for exertirig-pressure against the flat sides of the stack formed by the nested flat tubes, the pressure exerting means consisting of a pair of elements moving with less speed than the means for forwarding the blank during the folding operation.

17. A machine for producing bodies of conical paper containers, comprising means for continuously forwarding the blank, means for applying an adhesive strip to the blank, means for folding the lateral parts of the blank, means for nesting the produced Ila ubes, thus forming a flat stack, means for advancin gthe stack in a fiat condition, and means for opening said stack from a flat condition to a tubularone.

18. A machine as defined in claim 12, wherein the means for opening the flat stack consists of a pair of rotatable shaped rollers arranged at either side of the path of the forward stack of nested tubes in such distance from each other that the clearance between these rollers corresponds to the cross section of the opened stack.

19. A machine as defined in. claim 14, wherein the means for refiattening the open stack of nested containers consists of a pair of rotatable cylindrical rollers having their axes arranged vertically to the plane corresponding to the original flat condition of the stack.

KARL KiicnLER. 

